One-pot synthesis of magnetic algal carbon/sulfidated nanoscale zerovalent iron composites for removal of bromated disinfection by-product.
One-pot synthesis of magnetic algal carbon/sulfidated nanoscale zerovalent iron composites for removal of bromated disinfection by-product.
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DOI：
10.1016/j.chemosphere.2020.126257
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发表时间：
2020-02
期刊：
影响因子：
8.8
通讯作者：
Jian Lu;Cui Zhang;Jun Wu
中科院分区：
文献类型：
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作者：
Jian Lu;Cui Zhang;Jun Wu
首次采用一锅法合成了磁性藻碳负载花状硫化纳米零价铁（S-nZVI/AC）复合材料，并将其用于去除溴酸盐。在48 min内，溴酸盐的去除率可达98%以上。与单独的S-nZVI处理相比，S-nZVI/AC复合处理的去除速率常数几乎提高了一倍。当S/Fe比从0增加到0.3时，溴酸盐的去除速率常数增加了3倍。根据藻碳和S-nZVI对溴酸盐的协同去除作用，碳的引入和硫改性是提高S-nZVI/AC复合材料去除溴酸盐的有效改性途径。当复合投加量从0增加到40 mg L-1时，溴酸盐的去除率急剧增加到98%以上。当初始浓度从50 μg L-1增加到200 μg L-1时，去除速率常数从0.08 min-1线性增加到0.31 min-1。S-nZVI/AC复合材料对溴酸盐的去除率在5次循环后仍保持在较高水平（>85%）。溴酸盐在中性或微酸性条件下容易去除。当温度从15 ° C增加到35 °C时，溴酸盐去除速率常数从0.10增加到0.27 min-1。当离子强度从0增加到3 g L-1时，溴酸盐去除速率常数增加了近4倍。本研究表明，通过一锅法合成的S-nZVI/AC复合材料是一种很有前途的高效去除溴酸盐消毒副产物的净水材料。
Magnetic algal carbon supported flower-like sulfidated nanoscale zerovalent iron (S-nZVI/AC) composite was firstly synthesized through one-pot method and used for removing bromate. More than 98% of bromate was efficiently removed within 48 min. Compared with the individual S-nZVI treatment, the removal rate constant of the S-nZVI/AC composite treatment was almost doubled. The removal rate constant of bromate increased three times when the S/Fe ratio increased from 0 to 0.3. According to the synergistic effect between the algal carbon and S-nZVI on the bromate removal, the introduction of carbon and sulfide-modification of nZVI were efficient modification approaches for enhancing the removal of bromated using S-nZVI/AC composite. The removal efficiency of bromate increased sharply to more than 98% when the composite dose increased from 0 to 40 mg L−1. The removal rate constant increased linearly from 0.08 to 0.31 min−1when the initial concentration increased from 50 to 200 μg L−1. The removal efficiency of the bromate still maintained at high level (>85%) after 5 recycles of the S-nZVI/AC composite. Bromate was readily removed under neutral or slight acidic conditions. The bromate removal rate constant increased from 0.10 to 0.27 min−1when the temperature increased from 15 to 35 °C. The bromate removal rate constant increased almost 4 times when the ionic strength increased from 0 to 3 g L−1. This study demonstrates that S-nZVI/AC composite synthesized through one-pot method is a promising water purification material for efficient removal of bromated disinfection by-product.